image_data.cc revision 5821806d5e7f356e8fa4b058a389a808ea183019 
1// Copyright (c) 2012 The Chromium Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5#include "ppapi/cpp/image_data.h"
6
7#include <string.h>  // Needed for memset.
8
9#include <algorithm>
10
11#include "ppapi/cpp/instance_handle.h"
12#include "ppapi/cpp/module.h"
13#include "ppapi/cpp/module_impl.h"
14
15namespace pp {
16
17namespace {
18
19template <> const char* interface_name<PPB_ImageData_1_0>() {
20  return PPB_IMAGEDATA_INTERFACE_1_0;
21}
22
23}  // namespace
24
25ImageData::ImageData() : data_(NULL) {
26  memset(&desc_, 0, sizeof(PP_ImageDataDesc));
27}
28
29ImageData::ImageData(const ImageData& other)
30    : Resource(other),
31      desc_(other.desc_),
32      data_(other.data_) {
33}
34
35ImageData::ImageData(PassRef, PP_Resource resource)
36    : Resource(PASS_REF, resource),
37      data_(NULL) {
38  memset(&desc_, 0, sizeof(PP_ImageDataDesc));
39  InitData();
40}
41
42ImageData::ImageData(const InstanceHandle& instance,
43                     PP_ImageDataFormat format,
44                     const Size& size,
45                     bool init_to_zero)
46    : data_(NULL) {
47  memset(&desc_, 0, sizeof(PP_ImageDataDesc));
48
49  if (!has_interface<PPB_ImageData_1_0>())
50    return;
51
52  PassRefFromConstructor(get_interface<PPB_ImageData_1_0>()->Create(
53      instance.pp_instance(), format, &size.pp_size(),
54      PP_FromBool(init_to_zero)));
55  InitData();
56}
57
58ImageData& ImageData::operator=(const ImageData& other) {
59  Resource::operator=(other);
60  desc_ = other.desc_;
61  data_ = other.data_;
62  return *this;
63}
64
65const uint32_t* ImageData::GetAddr32(const Point& coord) const {
66  // Prefer evil const casts rather than evil code duplication.
67  return const_cast<ImageData*>(this)->GetAddr32(coord);
68}
69
70uint32_t* ImageData::GetAddr32(const Point& coord) {
71  // If we add more image format types that aren't 32-bit, we'd want to check
72  // here and fail.
73  return reinterpret_cast<uint32_t*>(
74      &static_cast<char*>(data())[coord.y() * stride() + coord.x() * 4]);
75}
76
77// static
78bool ImageData::IsImageDataFormatSupported(PP_ImageDataFormat format) {
79  if (!has_interface<PPB_ImageData_1_0>())
80    return false;
81  return PP_ToBool(get_interface<PPB_ImageData_1_0>()->
82      IsImageDataFormatSupported(format));
83}
84
85// static
86PP_ImageDataFormat ImageData::GetNativeImageDataFormat() {
87  if (!has_interface<PPB_ImageData_1_0>())
88    return PP_IMAGEDATAFORMAT_BGRA_PREMUL;  // Default to something on failure.
89  return get_interface<PPB_ImageData_1_0>()->GetNativeImageDataFormat();
90}
91
92void ImageData::InitData() {
93  if (!has_interface<PPB_ImageData_1_0>())
94    return;
95  if (!get_interface<PPB_ImageData_1_0>()->Describe(pp_resource(), &desc_) ||
96      !(data_ = get_interface<PPB_ImageData_1_0>()->Map(pp_resource())))
97    *this = ImageData();
98}
99
100}  // namespace pp
101